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Loans Receivable (excluding Covered Loans) (Loans Receivable, Analysis of Age of Loans in Past Due Status) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP $ 7,640,776 $ 7,653,050
Current 7,414,201 7,447,005
30 Days 56,801 41,202
60 Days 31,826 24,199
90 Days 137,948 140,644
Total 226,575 206,045
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.97% 2.69%
Non-Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 7,213,950 7,541,953
Current 6,993,713 7,345,497
30 Days 53,221 39,584
60 Days 31,302 21,560
90 Days 135,714 135,312
Total 220,237 196,456
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.05% 2.60%
Non-Acquired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 5,371,033 5,776,002
Current 5,215,549 5,618,261
30 Days 36,476 34,035
60 Days 25,148 16,276
90 Days 93,860 107,430
Total 155,484 157,741
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.89% 2.73%
Non-Acquired Loans [Member] | Construction - Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 81,265 88,849
Current 72,899 85,785
30 Days 1,373 142
60 Days 1,911 190
90 Days 5,082 2,732
Total 8,366 3,064
Ratio of past due loans to total loans, net of charge-offs and LIPs 10.29% 3.45%
Non-Acquired Loans [Member] | Construction - Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 120,793 107,882
Current 120,575 107,215
30 Days 32 128
60 Days 147 0
90 Days 39 539
Total 218 667
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.18% 0.62%
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 88,357 119,192
Current 75,892 106,321
30 Days 557 853
60 Days 231 1,004
90 Days 11,677 11,014
Total 12,465 12,871
Ratio of past due loans to total loans, net of charge-offs and LIPs 14.11% 10.80%
Non-Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 129,887 141,772
Current 125,094 134,560
30 Days 724 1,688
60 Days 45 375
90 Days 4,024 5,149
Total 4,793 7,212
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.69% 5.09%
Non-Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 697,943 676,917
Current 686,954 672,263
30 Days 3,102 718
60 Days 130 67
90 Days 7,757 3,869
Total 10,989 4,654
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.57% 0.69%
Non-Acquired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 360,607 292,261
Current 341,041 284,427
30 Days 5,154 699
60 Days 2,858 3,153
90 Days 11,554 3,982
Total 19,566 7,834
Ratio of past due loans to total loans, net of charge-offs and LIPs 5.43% 2.68%
Non-Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 198,488 162,802
Current 192,479 162,778
30 Days 4,386 8
60 Days 636 0
90 Days 987 16
Total 6,009 24
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.03% 0.01%
Non-Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 111,622 112,902
Current 111,322 112,482
30 Days 128 158
60 Days (227) 64
90 Days 399 198
Total 300 420
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.27% 0.37%
Non-Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 53,955 63,374
Current 51,908 61,405
30 Days 1,289 1,155
60 Days 423 431
90 Days 335 383
Total 2,047 1,969
Ratio of past due loans to total loans, net of charge-offs and LIPs 3.79% 3.11%
Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 327,383  
Current 325,461  
30 Days 1,899  
60 Days 5  
90 Days 18  
Total 1,922  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.59%  
Acquired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 15,428  
Current 15,312  
30 Days 116  
60 Days 0  
90 Days 0  
Total 116  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.75%  
Acquired Loans [Member] | Construction - Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 177  
Current 177  
30 Days 0  
60 Days 0  
90 Days 0  
Total 0  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00%  
Acquired Loans [Member] | Construction - Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 313  
Current 313  
30 Days 0  
60 Days 0  
90 Days 0  
Total 0  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00%  
Acquired Loans [Member] | Land - Acquisition & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 3,436  
Current 3,436  
30 Days 0  
60 Days 0  
90 Days 0  
Total 0  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00%  
Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 3,819  
Current 3,767  
30 Days 52  
60 Days 0  
90 Days 0  
Total 52  
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.36%  
Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 7,714  
Current 7,714  
30 Days 0  
60 Days 0  
90 Days 0  
Total 0  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00%  
Acquired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 177,101  
Current 176,444  
30 Days 657  
60 Days 0  
90 Days 0  
Total 657  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.37%  
Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 96,255  
Current 95,258  
30 Days 997  
60 Days 0  
90 Days 0  
Total 997  
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.04%  
Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 13,094  
Current 13,094  
30 Days 0  
60 Days 0  
90 Days 0  
Total 0  
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00%  
Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 10,046  
Current 9,946  
30 Days 77  
60 Days 5  
90 Days 18  
Total 100  
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.00%  
Credit Impaired Acquired Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 99,443 111,097
Current 95,027 101,508
30 Days 1,681 1,618
60 Days 519 2,639
90 Days 2,216 5,332
Total 4,416 9,589
Ratio of past due loans to total loans, net of charge-offs and LIPs 4.44% 8.63%
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 338 342
Current 338 342
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Construction - Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 1,749 1,889
Current 1,749 1,889
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Construction - Custom [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 0 0
Current 0 0
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 2,577 3,702
Current 2,577 3,219
30 Days 0 365
60 Days 0 0
90 Days 0 118
Total 0 483
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 13.05%
Credit Impaired Acquired Loans [Member] | Land - Consumer Lot Loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 0 0
Current 0 0
30 Days 0 0
60 Days 0 0
90 Days 0 0
Total 0 0
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Multi-Family [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 0 601
Current 0 0
30 Days 0 601
60 Days 0 0
90 Days 0 0
Total 0 601
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 0.00%
Credit Impaired Acquired Loans [Member] | Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 79,850 87,134
Current 75,772 78,959
30 Days 1,660 412
60 Days 292 2,549
90 Days 2,126 5,214
Total 4,078 8,175
Ratio of past due loans to total loans, net of charge-offs and LIPs 5.11% 9.38%
Credit Impaired Acquired Loans [Member] | Commercial & Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 2,091 3,292
Current 2,070 3,054
30 Days 21 238
60 Days 0 0
90 Days 0 0
Total 21 238
Ratio of past due loans to total loans, net of charge-offs and LIPs 1.00% 7.23%
Credit Impaired Acquired Loans [Member] | HELOC [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 12,757 14,040
Current 12,440 13,950
30 Days 0 0
60 Days 227 90
90 Days 90 0
Total 317 90
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.48% 0.64%
Credit Impaired Acquired Loans [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of Loan, Net of Charge-Offs and LIP 81 97
Current 81 95
30 Days 0 2
60 Days 0 0
90 Days 0 0
Total $ 0 $ 2
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.00% 2.06%